[amp_mcq option1=”Inrush protection” option2=”Distance protection” option3=”Time graded and current graded over current protection” option4=”Both (B) and (C)” correct=”option4″]
Switchgear protections
42. Arc in a circuit behaves as
[amp_mcq option1=”a capackive reactance” option2=”an inductive reactance” option3=”a resistance increasing with voltage rise across the arc” option4=”a resistance decreasing with voltage rise across the arc” correct=”option3″]
43. Distance relays are generally
[amp_mcq option1=”split-phase relays” option2=”reactance relays” option3=”impedance relays” option4=”none of the above” correct=”option3″]
44. The material used for fuse must have
[amp_mcq option1=”low melting point and high specific resistance” option2=”low melting point and -low specific resistance” option3=”high melting point and low specific resistance” option4=”low melting point and any specific resistance” correct=”option1″]
45. Insulation resistance of high voltage circuit breakers is more than
[amp_mcq option1=”1 mega ohms” option2=”10 mega ohms” option3=”100 mega ohms” option4=”500 mega ohms” correct=”option4″]
Detailed SolutionInsulation resistance of high voltage circuit breakers is more than
46. The single phasing relays are used for the protection of
[amp_mcq option1=”single phase motors only” option2=”two phase motors only” option3=”two single phase motors running in parallel” option4=”three phase motors” correct=”option1″]
Detailed SolutionThe single phasing relays are used for the protection of
47.
[amp_mcq option1=”Load flow” option2=”Load flow and short-circuit” option3=”network analyzer is used to solve problems of A. Load flow B. Load flow and short-circuit C. Load flow and stability” option4=”Load flow, short-circuit and stability” correct=”option4″]
48. A differential relay measures the vector difference between
[amp_mcq option1=”two currents” option2=”two voltages” option3=”two or more similar electrical quantities” option4=”none of the above” correct=”option1″]
Detailed SolutionA differential relay measures the vector difference between
49. To reduce short circuit fault currents are used.
[amp_mcq option1=”reactors” option2=”resistors” option3=”capacitors” option4=”none of the above” correct=”option1″]
Detailed SolutionTo reduce short circuit fault currents are used.
50. Protection by fuses is generally not used beyond
[amp_mcq option1=”20 A” option2=”50 A” option3=”100 A” option4=”200 A” correct=”option1″]
Detailed SolutionProtection by fuses is generally not used beyond